JPS5920015A - Controller for temperature of heating furnace - Google Patents

Controller for temperature of heating furnace

Info

Publication number
JPS5920015A
JPS5920015A JP12895882A JP12895882A JPS5920015A JP S5920015 A JPS5920015 A JP S5920015A JP 12895882 A JP12895882 A JP 12895882A JP 12895882 A JP12895882 A JP 12895882A JP S5920015 A JPS5920015 A JP S5920015A
Authority
JP
Japan
Prior art keywords
output
temperature
value
set
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP12895882A
Inventor
Gi Hisayoshi
Saburo Hoshino
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP12895882A priority Critical patent/JPS5920015A/en
Publication of JPS5920015A publication Critical patent/JPS5920015A/en
Application status is Pending legal-status Critical

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/1906Control of temperature characterised by the use of electric means using an analogue comparing device

Abstract

PURPOSE:To allow the temperature to fall to a temperature for keeping warm in a short time, by outputting the operation output value from an independently provided manipulated variable setter when the deviation from a temperature measured value is larger than a prescribed value and switching the output to the output from a PID operator when this deviation is smaller than the prescribed value. CONSTITUTION:An intra-furnace temperature set value 10 is set to the temperature for keeping warm and is detected by a lower limit alarm device 13. The output of a deviation operator 12 is detected by an upper limit alarm device 14. AND between a switch signal of an interlock 15, which determines whether minimum flow setting is performed or not through the logic operation, and output signals of alarm devices 13 and 14 is operated in an AND gate 16, and a switch 18 is switched to the side of a terminal (a) to the side of a terminal (b) by this gate output. Thus, the signal to an output processing part 19 is switched to the signal obtained by allowing a signal from a preliminarily set minimum setter 20 to pass through the side of the terminal (b) of a switch 23. The minimum set value of the setter 20 is set to a minimum set value where combustion in the furnace is continued.
JP12895882A 1982-07-26 1982-07-26 Controller for temperature of heating furnace Pending JPS5920015A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12895882A JPS5920015A (en) 1982-07-26 1982-07-26 Controller for temperature of heating furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12895882A JPS5920015A (en) 1982-07-26 1982-07-26 Controller for temperature of heating furnace

Publications (1)

Publication Number Publication Date
JPS5920015A true JPS5920015A (en) 1984-02-01

Family

ID=14997614

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12895882A Pending JPS5920015A (en) 1982-07-26 1982-07-26 Controller for temperature of heating furnace

Country Status (1)

Country Link
JP (1) JPS5920015A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449550A2 (en) * 1990-03-27 1991-10-02 Honeywell Inc. Thermostat with means for disabling PID control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449550A2 (en) * 1990-03-27 1991-10-02 Honeywell Inc. Thermostat with means for disabling PID control

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